你可以将一个InputStream传递给属性，所以你的文件几乎可以在任何地方，并被称为任何东西。

Properties properties = new Properties();
try {
  properties.load(new FileInputStream("path/filename"));
} catch (IOException e) {
  ...
}

迭代:

for(String key : properties.stringPropertyNames()) {
  String value = properties.getProperty(key);
  System.out.println(key + " => " + value);
}

您可以通过以下方式加载属性文件:

InputStream is = new Test().getClass().getClassLoader().getResourceAsStream("app.properties");
        Properties props =  new Properties();
        props.load(is);

然后你可以使用lambda表达式遍历映射，比如:

props.stringPropertyNames().forEach(key -> {
            System.out.println("Key is :"+key + " and Value is :"+props.getProperty(key));
        });

在Java 8中获取所有属性

public static Map<String, String> readPropertiesFile(String location) throws Exception {

    Map<String, String> properties = new HashMap<>();

    Properties props = new Properties();
    props.load(new FileInputStream(new File(location)));

    props.forEach((key, value) -> {
        properties.put(key.toString(), value.toString());
    });

    return properties;
}

加载属性文件:

Properties prop = new Properties();
InputStream stream = ...; //the stream to the file
try {
  prop.load(stream);
} finally {
  stream.close();
}

我把.properties文件放在一个存放所有配置文件的目录中，我没有把它与访问它的类放在一起，但这里没有限制。

对于这个名字…为了冗长起见，我使用。properties，如果你不想的话，我认为你不应该把它命名为。properties。

如果将属性文件放在与类Foo相同的包中，就可以轻松地加载它

new Properties().load(Foo.class.getResourceAsStream("file.properties"))

鉴于Properties扩展了哈希表，您可以以与在哈希表中相同的方式遍历值。

如果你使用*。你可以获得编辑器支持，例如Eclipse有一个属性文件编辑器。

这里是就绪静态类

import java.io.*;
import java.util.Properties;
public class Settings {
    public static String Get(String name,String defVal){
        File configFile = new File(Variables.SETTINGS_FILE);
        try {
            FileReader reader = new FileReader(configFile);
            Properties props = new Properties();
            props.load(reader);
            reader.close();
            return props.getProperty(name);
        } catch (FileNotFoundException ex) {
            // file does not exist
            logger.error(ex);
            return defVal;
        } catch (IOException ex) {
            // I/O error
            logger.error(ex);
            return defVal;
        } catch (Exception ex){
            logger.error(ex);
            return defVal;
        }
    }
    public static Integer Get(String name,Integer defVal){
        File configFile = new File(Variables.SETTINGS_FILE);
        try {
            FileReader reader = new FileReader(configFile);
            Properties props = new Properties();
            props.load(reader);
            reader.close();
            return Integer.valueOf(props.getProperty(name));
        } catch (FileNotFoundException ex) {
            // file does not exist
            logger.error(ex);
            return defVal;
        } catch (IOException ex) {
            // I/O error
            logger.error(ex);
            return defVal;
        } catch (Exception ex){
            logger.error(ex);
            return defVal;
        }
    }
    public static Boolean Get(String name,Boolean defVal){
        File configFile = new File(Variables.SETTINGS_FILE);
        try {
            FileReader reader = new FileReader(configFile);
            Properties props = new Properties();
            props.load(reader);
            reader.close();
            return Boolean.valueOf(props.getProperty(name));
        } catch (FileNotFoundException ex) {
            // file does not exist
            logger.error(ex);
            return defVal;
        } catch (IOException ex) {
            // I/O error
            logger.error(ex);
            return defVal;
        } catch (Exception ex){
            logger.error(ex);
            return defVal;
        }
    }
    public static void Set(String name, String value){
        File configFile = new File(Variables.SETTINGS_FILE);
        try {
            Properties props = new Properties();
            FileReader reader = new FileReader(configFile);
            props.load(reader);
            props.setProperty(name, value.toString());
            FileWriter writer = new FileWriter(configFile);
            props.store(writer, Variables.SETTINGS_COMMENT);
            writer.close();
        } catch (FileNotFoundException ex) {
            // file does not exist
            logger.error(ex);
        } catch (IOException ex) {
            // I/O error
            logger.error(ex);
        } catch (Exception ex){
            logger.error(ex);
        }
    }
    public static void Set(String name, Integer value){
        File configFile = new File(Variables.SETTINGS_FILE);
        try {
            Properties props = new Properties();
            FileReader reader = new FileReader(configFile);
            props.load(reader);
            props.setProperty(name, value.toString());
            FileWriter writer = new FileWriter(configFile);
            props.store(writer,Variables.SETTINGS_COMMENT);
            writer.close();
        } catch (FileNotFoundException ex) {
            // file does not exist
            logger.error(ex);
        } catch (IOException ex) {
            // I/O error
            logger.error(ex);
        } catch (Exception ex){
            logger.error(ex);
        }
    }
    public static void Set(String name, Boolean value){
        File configFile = new File(Variables.SETTINGS_FILE);
        try {
            Properties props = new Properties();
            FileReader reader = new FileReader(configFile);
            props.load(reader);
            props.setProperty(name, value.toString());
            FileWriter writer = new FileWriter(configFile);
            props.store(writer,Variables.SETTINGS_COMMENT);
            writer.close();
        } catch (FileNotFoundException ex) {
            // file does not exist
            logger.error(ex);
        } catch (IOException ex) {
            // I/O error
            logger.error(ex);
        } catch (Exception ex){
            logger.error(ex);
        }
    }
}

以下示例:

Settings.Set("valueName1","value");
String val1=Settings.Get("valueName1","value");
Settings.Set("valueName2",true);
Boolean val2=Settings.Get("valueName2",true);
Settings.Set("valueName3",100);
Integer val3=Settings.Get("valueName3",100);